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Finding the Fourth Proportional to 718.55, 1,078.37 and 486.89

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Solution

The fourth proportional to 718.55, 1,078.37 and 486.89 is: 730.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.55 : 1,078.37 = 486.89 : x
  2. Step 2: Convert to fraction form
    718.55/1,078.37 = 486.89/x
  3. Step 3: Cross multiply
    718.55x = 1,078.37 × 486.89
  4. Step 4: Simplify right side
    718.55x = 525,045.13
  5. Step 5: Solve for x
    x = 525,045.13/718.55
  6. Step 6: Final answer
    x = 730.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.